這個研究首先是觀察以正交偏振光回饋激發Fabry-Perot型半導體雷射產生單縱模高速光脈衝之可行性。藉由這個技術我們觀察到了470 MHz及3.76 GHz的單縱模高速光脈衝。研究過程中我們發展了一套修正版的理論模型來解釋原先由Otsuka 和陳志隆教授所提的理論中與實驗結果不合的地方。同時這個理論模型也解決了回饋距離太短的問題，使得這個技術有機會運用在現行的系統當中。

除此之外，這個研究也成功地以正交偏振光回饋的技術重建了遲滯型模跳躍雷射的失落縱模，而且能夠將雷射的功率及模態維持在原先的水準。同時我們也發現這個技術可以有效的抑制模躍遷的發生。

最後，我們也以此一技術進行了同調回饋雜訊的抑制。研究結果發現，利用–29 dB的正交偏振回饋光將可以順利的抑制同調回饋雜訊的產生並且讓雷射的模態壓縮比變得更好。就我們所知，這些發現將有助於提升半導體雷射在應用上的價值。

This research investigated the characteristics of single-mode optical pulses generated with orthogonal-polarization optical feedback (OPF) in Fabry-Perot type semiconductor lasers. Single-mode pulse trains with a pulse frequency of 470 MHz and 3.76 GHz were observed. A modified model was proposed to solve the inconsistency between the experimental results and the computer simulations of Otsuka and Chern’s model. These results also solve the problem of a round-trip feedback distance that is too short to enable the feedback system to be implemented, making this technology accomplishable in currently working systems.

Furthermore, this investigation recovered and maintained a stable oscillation of every missing longitudinal mode in a hysteresis type mode-hopping gap of a semiconductor laser. A special feature of this method is that both the laser power and spectral purity are preserved during mode recovery and mode switching. The experimental results also reveal that the OPF effectively suppressed mode-hopping in semiconductor lasers and drove the laser into a stable single-mode state.

Finally, this research employed OPF to suppress the intensity noise stimulated by coherent optical feedback in a semiconductor laser. At a coherent-feedback level as strong as –14 dB, an OPF ratio of –29 dB could return the laser to its primitive single mode from the multimode, yielding a spectral purity and relative intensity noise (RIN) even better than the solitary values. These discoveries constitute an important contribution to our understanding of applications of semiconductor lasers.

中文摘要……………………………………………………………i
英文摘要……………………………………………………………ii
致謝辭………………………………………………………………iii
目錄…………………………………………………………………iv
圖表目錄……………………………………………………………vi

第一章 簡介………………………………………………………1
第二章 半導體雷射在光回饋下之速率方程式…………………8
第2-1節 速率方程式………………………………………………9
第2-2節 同調光回饋下之速率方程式……………………………21
第2-3節 正交偏振光回饋下之速率方程式………………………28
第三章 半導體雷射在正交偏振光回饋下產生高速光脈衝之研究…59
第3-1節 產生高速光脈衝之技術…………………………………60
第3-2節 正交偏振光回饋產生高速光脈衝之原理………………63
第3-3節 實驗系統介紹……………………………………………65
第3-4節 正交偏振光回饋產生高速調變脈衝之研究……………73
第3-5節 正交偏振光回饋產生Giga-Hertz單縱模高速光脈衝之研究77
第四章 正交偏振回饋光對半導體雷射縱模之影響研究………107
第4-1節 半導體雷射模態說明…………………………………108
第4-2節 半導體雷射的縱模行為………………………………113
第4-3節 正交偏振光回饋對半導體雷射縱模分佈之影響……115
第4-4節 以正交偏振光回饋重建失落縱模(Missing Mode)之研究117
第4-5節 以正交偏振光回饋抑制模躍遷(Mode Hopping)之研究…121
第五章 正交偏振光回饋對半導體雷射同調回饋雜訊抑制之研究…153
第5-1節 克服同調光回饋所引起的雜訊之技術………………154
第5-2節 同調回饋雜訊抑制之研究……………………………159
第六章 結論………………………………………………………176
第七章 後續研究發展及建議……………………………………179

附錄A Runge-Kutta Method……………………………………184
附錄B正交偏振光回饋下單縱模半導體雷射速率方程式修正版之電腦模擬主程式………………………………………………………186
附錄C 正交偏振光回饋下多縱模半導體雷射速率方程式修正版之電腦模擬主程式………………………………………………………189

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